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Apologies up front — this is super basic, but I’m sleep deprived and on a deadline for a personal project.

This is all DC. I have a 12 V input (via a wall-wart). I need 5 V to power some electronics (Raspberry Pi) and 12 V to power some other electronics (display). I plan to use a buck converter to drop from 12 V to 5 V.

Is there any reason I can’t just wire the 12 V load and the buck converter in parallel?

For some reason, it’s in my head that doing so is a bad idea, but I can’t come up with any reason why.

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    \$\begingroup\$ Connecting the 12 volt load and the buck converter in parallel to the 12 volt supply would be the normal thing to do. How else would you connect them? \$\endgroup\$ Commented Mar 13, 2022 at 17:28
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    \$\begingroup\$ @PeterBennett: simple as it sounds, that's a good answer. You should copy & paste it in below. The only thing I'd add is if, for some reason you needed quiet 12V power you may have a problem -- but if the 12V is coming from a wall-wart, there's already a switching supply in the mix, so you probably won't harm things any more. \$\endgroup\$
    – TimWescott
    Commented Mar 13, 2022 at 17:30
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    \$\begingroup\$ I have no idea what else you would do. That was the plan all along, then while reviewing it I thought “no, that’s dangerous”. I have no idea why. Like I said, I’m on a steep sleep deficit right now, so hesitate to trust my own judgement. \$\endgroup\$
    – fectin
    Commented Mar 13, 2022 at 17:31
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    \$\begingroup\$ Understand. Everyone's been there, where you need someone to double-check that 2+2=4 because you're seeing blurry and double on your fifth 4-hour night :-) Good luck with it, don't forget to accept the answer if it's correct, upvoting as you prefer. \$\endgroup\$
    – TonyM
    Commented Mar 13, 2022 at 17:55
  • \$\begingroup\$ Thanks everyone. It works fine, as you would expect. \$\endgroup\$
    – fectin
    Commented Mar 14, 2022 at 23:55

1 Answer 1

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Connecting the 12 volt load and the buck converter in parallel to the 12 volt supply would be the normal thing to do.

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